Convert String data type to Objectid

[waseefur.rahman]

Hi Everyone,

Is there any way to convert string data type to objectid
i tried the below method to convert, but getting the error.

Could any one please advice, how to convert string data type to objectid.

Thanks in Advance

[_gile]

Hi,

I don't know where is this string from, but you can try something like this:

new ObjectId(new IntPtr(long.Parse(str)));

[waseefur.rahman]

Hi @_gile 

Actually i have stored Objectids in String collection,
and i want it to convert back string to object id.

can you please advice how to convert data type string to objectid.

Thanks

[waseefur.rahman]

Hi @_gile 

I tried you  method but getting error as 'eUnknownHandle'
see the below image


could you please advice a where i am doing wrong?
Thanks

[_gile]

Handle and ObjectId are two different identifiers.

Handles are unique per drawing persistant, ObjectIds are unique per session and not persistant (re-created and possibly different each time the drawing is opened).

You should show the code with which you get this string.

[jabowabo]

If you are determined to use a list of object ids, why not just iterate all drawing objects, cast each of their ids to a string, then see if the list contains it? This is likely as fast as any other method.

[_gile · Accepted solution]

We do not know what exactly Allobj_ids is (except it is a string array) and in which context is used.

If it is used within the same session of the drawing, you should not convert the ObjectId instances into strings and simply use an ObjectId array or an ObjectIdCollection.

If it used in a different session, the string array should be based on Handles instead of ObjectIds.

[waseefur.rahman]

Hi Gile,

As per your suggestion i stored Handle to String Collection,
but when i tried to modify entity property, 
like changing the layer name,
i got the error as eKeyNotFound.

attached the Code Snip below,

Could you please advice where i am doing wrong.
Thanks

[_gile]

This is a totally different error.

This time the error is due to the fact none LayerTableRecord named: Cur_NM + "_Split_" + Split_Lay.ToString() exists in the layer table.

[waseefur.rahman]

Hi @_gile ,

That's onspot,
you nailed it,
Now i will have a pleasant sleep tonight..
have a good night..
really thankful for your help..